Which do you prefer to use to keep in touch with your friends，QQ__________MSN?
#56400
A
and
B
but
C
or
D
so
推荐题目
Some physics problems in this book are _________difficult for the students _________work out.
#55219
A
so; that
B
not; but
C
such; that
D
too; to
Some people won’t realize the importance of their health ______ they have lost it.
#58394
A
after
B
when
C
until
D
as
Kelly Clarkson is so popular among young people _____ her beautiful voice.
#55865
A
because
B
because of
C
instead
D
instead of